For your own use, when you define your dependency, add the classifier tag with a value of small.
<dependency>
<groupId>myGroup</groupId>
<artifactId>myJar</artifactId>
<scope>test</scope>
<classifier>small</classifier> <!-- <<<<<< like this <<<<<< -->
</dependency>
For publishing, you can manually deploy the artifact with a new classifier as demonstrated here:
http://maven.apache.org/plugins/maven-deploy-plugin/examples/deploying-with-classifiers.html